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SN74AVC16T245-Q1: Question about Maximum Data Rates

user3746678
Intellectual 400 points
Part Number: SN74AVC16T245-Q1
Other Parts Discussed in Thread: SN74AVC8T245-Q1, SN74AXC8T245-Q1

Hi, TI Engineers

In SN74AVC16T245-Q1 datasheet, it describes maxmimum data rates as follows:

what does "200Mbps(Translate to 2.5V or 1.8V )"mean ? when translate from 3.3V to 1.8V ,the maximum data rate is 200Mbps? when translate form 1.8V to 3.3V ,the maximum data rate is 380M bps?

My use case is translating between 1.8V RGMII interface and 3.3V RGMII interface, whether SN74AVC16T245-Q1 is appropriate for my use case ?

Thank you.

Regards.

Gavin Zhang

  • 0
    TI__Genius 16725 points

    Hi Gavin,

    What that means is that you can translate from any voltage to an output voltage of 2.5V or 1.8V, a maximum data rate of 200 Mbps can be achieved. 200 Mbps is equivalent to 100MHz.

    I don't know much about the RGMII interface. I am thinking your concern is whether this will support the speeds you need. So, if the frequency you require is very close to the 380 Mbps, this device might not work for you. But again, you need to let me know more on this.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Intellectual 400 points

    Hi，Karan

    RGMII interface data rate is 250Mbps (125MHz），my requirements are as follows:

    1. in every direction(from A to B  and from B to A),max data rate must up to 250M bps

    2. bidirectional voltage level translate between 1.8V and 3.3V .

    3. automotive rating

    I think  SN74AVC16T245-Q1 do not  work for me, how about sn74avc8t245-q1?

    Thanks.

    Regards.

    Gavin

  • 0 in reply to user3746678
    Guru 254440 points

    The SN74AVC8T245-Q1 datasheet claims 320 Mbps at 1.8 V.

    But I would suggest the SN74AXC8T245-Q1, which is somewhat faster and optimized for that voltage.

  • 0 in reply to Clemens Ladisch
    Intellectual 400 points

    Hi,Clemens

    In SN74AXC8T245-Q1 datasheet , it  just claims that the maximum data rate is 380Mbps when translating from 1.8V to 3.3V ,but what ’s the maximum data rate when translating from 3.3V to 1.8V ,is it also still 380Mbps?

    Thank you.

    Regards.

    Gavin Zhang

  • 0 in reply to user3746678
    Guru 254440 points

    Section 6.11 shows that the 3.3 V to 1.8 V propagation delay is smaller than that for 1.8 V to 3.3 V.